diff options
| author | Adrien Leravat <Pixep@users.noreply.github.com> | 2019-06-21 22:40:16 -0700 |
|---|---|---|
| committer | Adrien Leravat <Pixep@users.noreply.github.com> | 2019-06-24 21:14:38 -0700 |
| commit | 3688e6e99d16b0c6ecb7c8b3528a541ce6afe3a7 (patch) | |
| tree | 594793c2f2fb2fc702cfa22ee57b3ad902219181 /pkg/sentry/syscalls/linux | |
| parent | e9ea7230f7dc70d3e1bb5ae32b6927209cafb465 (diff) | |
Add CLOCK_BOOTTIME as a CLOCK_MONOTONIC alias
Makes CLOCK_BOOTTIME available with
* clock_gettime
* timerfd_create
* clock_gettime vDSO
CLOCK_BOOTTIME is implemented as an alias to CLOCK_MONOTONIC.
CLOCK_MONOTONIC already keeps track of time across save
and restore. This is the closest possible behavior to Linux
CLOCK_BOOTIME, as there is no concept of suspend/resume.
Updates google/gvisor#218
Diffstat (limited to 'pkg/sentry/syscalls/linux')
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_time.go | 7 | ||||
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_timerfd.go | 2 |
2 files changed, 7 insertions, 2 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_time.go b/pkg/sentry/syscalls/linux/sys_time.go index fe8725191..0f36e4cd0 100644 --- a/pkg/sentry/syscalls/linux/sys_time.go +++ b/pkg/sentry/syscalls/linux/sys_time.go @@ -121,8 +121,13 @@ func getClock(t *kernel.Task, clockID int32) (ktime.Clock, error) { switch clockID { case linux.CLOCK_REALTIME, linux.CLOCK_REALTIME_COARSE: return t.Kernel().RealtimeClock(), nil - case linux.CLOCK_MONOTONIC, linux.CLOCK_MONOTONIC_COARSE, linux.CLOCK_MONOTONIC_RAW: + case linux.CLOCK_MONOTONIC, linux.CLOCK_MONOTONIC_COARSE, + linux.CLOCK_MONOTONIC_RAW, linux.CLOCK_BOOTTIME: // CLOCK_MONOTONIC approximates CLOCK_MONOTONIC_RAW. + // CLOCK_BOOTTIME is internally mapped to CLOCK_MONOTONIC, as: + // - CLOCK_BOOTTIME should behave as CLOCK_MONOTONIC while also including suspend time. + // - gVisor has no concept of suspend/resume. + // - CLOCK_MONOTONIC already includes save/restore time, which is the closest to suspend time. return t.Kernel().MonotonicClock(), nil case linux.CLOCK_PROCESS_CPUTIME_ID: return t.ThreadGroup().CPUClock(), nil diff --git a/pkg/sentry/syscalls/linux/sys_timerfd.go b/pkg/sentry/syscalls/linux/sys_timerfd.go index ea6d44315..b889a2a93 100644 --- a/pkg/sentry/syscalls/linux/sys_timerfd.go +++ b/pkg/sentry/syscalls/linux/sys_timerfd.go @@ -38,7 +38,7 @@ func TimerfdCreate(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel switch clockID { case linux.CLOCK_REALTIME: c = t.Kernel().RealtimeClock() - case linux.CLOCK_MONOTONIC: + case linux.CLOCK_MONOTONIC, linux.CLOCK_BOOTTIME: c = t.Kernel().MonotonicClock() default: return 0, nil, syserror.EINVAL |